Cutting-off tool



Nov. 8, "1927. 4 1,647,989

' r E. as. GIBBS CUTTING-DFF- T601:

Filed Nov.l4, 1922 a MUWOZ Patented Nov. 8, 1927.

UNITED STATES PATENT oFFioa.

CUTTING-OFF TOOL.

Application filed November 14-, 1922. Serial No. 600,875.

This invention relates to new and useful improvements in cutting-01f tools, such as may be used on common engine lathes for cutting off any such substances as are held 5 and rotated by the said lathes. I do not mean to limit myself, however, in any sense,

except as required by the scope of the claims. I

The invention is hereinafter fully described, shown in the accompanying drawings, which form a part of this specification, and then specifically defined in the appended claims.

The main object sought in this invention is to obtain a cuttingoif tool, for engine lathe work chiefly, which will utilize on the rear (operators) side of an engine lathe, the

well known advantages employed in cutting off from the front side (as do most turret lathes).

Other objects are, to utilize the existing means of clamping the proposed toolto the tool seat; to provide means for vary ng its elevation; to extend the cutter support'beyond the base piece; to make the tool horizontally reversible, or capable of right or left-hand work and capable of being manufactured economically.

To this end I have designed and developed what I call the backstroke cutting-off tool; which cuts as lathe runs backwards. It 13 fully illustrated in the accompanying drawings, inwhich I Figure 1 is a rear end elevation of the tool complete; in working position, and fitted 3 over the tool post, which also is shown, as

are the rear end of the rectangular clamping bar and tool seat. It shows also the axial line of the lathe center.

Fig. 2 is a plan view of the tool complete.

Fig. 3 is a left-side view of the baseplate mounted on the false bottom, with the ntervening elevating liners clamped in position.

Fig. 4 is an inner side view of the angled cutter clamp referred to as the clamp.

Fig. 5 is aside view of the cutter blade, referred to as the cutter, or blade.

Reference now being had to the details of the drawing by letter, similar letters refer to similar parts throughout the several views.

A'designates the cutter blade.

B designates the right angled base piece, 6 the clamping aperture, 6 the open cutter channel, I)? the wall, 79* the flange, 6 the cutter clamping screw holes threaded or blank holes, b the false bottom clamping screw threaded holes.

C designates the right-angled cutter clamp, c the overhanging lip, c the depres sion in the vertical wing and 0 the clamping screw holes of the cutter clamp.

D designates the tool seat of the lathe.

E designates the tool post of the lathe.

F designates a rectangular clamping bar. b it designates the cutter clamping screws or H designates the false bottom.

I designates the inserted liners. I

J designates the false bottom clamping screws.

XX designates the axial center line of the lathes.

The construction of the tool is thus described: It consists, in brief, of a flat, inverted and elevated cutter blade A, which is also beveled on both sides, ground flat on both edges, and clamped by screw-pressure between two interlocking angle irons; one a right-angled base piece, B, and the other a similar but inverted right-angled cutter clamp, C and both preferably steel castings. It rests on the tool seat, D,'claniped'by the tool post E and rectangular bar, F.

The said base piece, known in shop practice as an angle iron, has two wings, the horizontal and the vertical, and has an aperture, 6, through its horizontal wing, which adapts it to fit over or engage the tool post, or other clamping device, while an outer portion of its vertical wing not necessarily integral is cut away or recessed horizontally, from its top down to a line approximately level with the axis of the lathe, leaving an open channel, N, with a slightly inclined high wall, 6 on one side with cutting edge downward leaning outwardly at top and a low flange 6 on the other; in which the beveled cutter blade is adapted to rest, vertically true with cutting edge downward,extensible and horizontally reversible and project slightly above the said wall. v

The said cutter clamp, another angle iron, hangs entirely suspended upon the cutter blade. Its horizontal wing, drawn by two clamping screws or bolts,G, fitted in screw holes 0 and b bears upon and supports the said blade, its overhanging lip, 0, engages the outer top edge of the same and simultaneously presses it against the wall 6 while its vertical wing hangs supportedbelow only-by side, pressure againstthe ver- I lflllear side:requirestheuseofian inverted cut- .te'r' blade, with cu'tting e'd'ge turned tlbwll- Iward, and preferablyilevel with the axis of -'the. lathe, as line Fig. 1. Therefore, the entire cutter must'i-be elevated above the saidaxis; whereas with the iront stroke tool the cutting edge is in the same planebutthe entire cutter is below the-axis. It requires ".alsofan"extended'bl'ade support, such as a ,cutte'r clamp, extended well beyond 'tlie base piece; and clamp screws extendedas i ar e as practical.

Provision is niafle ffbl ii y g z I clamping the said tool .to the tool seat of an .-.;tion of' this'ftool by 'introdu'cing'tl'iefalse botf tOIn TI-I," inserting theliners, I, of any. de-

e5 {sired thickness; and binding allfl with the 4 dam ing screws, J, fitted intof'tliei'screw holes bfi i v g lThis to olfis also reversible, as it is changed Yffrom Llightfhand to a leftha'iid tool simply V byI-swingingit around on the tool post; and

'the cutter,lreversed fand extended orl'witl'rh operation 't'h-istool. naturally holds the lathe spindle down in'its bearings',' 'without chatted and when 0' erloaded -,itnaturally fs'pri'ngs backward, relieving itself, 1 Having'thus described my invention, I desire to secure 'whafl'is new, and'fsnbrn'it the l h v g 1 ,clamp hav ng a screw pressed horizontal wing with an overhanging lip adapted to following appended claims y 4 11. .an artielefotn aniitactiire,,a base piece "for aback-stroke puttin -ma tool, of the characterdescribed, comprising an angle iron having .a horizontal wing whichisaper- ,tured to engage a clamping tooljpost, and i5 provided with iscre wlholes toiengage clamp ing screwsto bindv a false bottom; having lalso a vertical wing provided with cutter clamp'ing screw holes,.and-a horizontal, lopen -cutter'lioldingechannel cut in its outer surso'facefiromlits top edge down to aline level with the'a'xis of-allathe to whic'hit is adapted,leaving a high wallon-one side, leaning outwardly at "the top and low flange on the other; all substantially as set forth.

2. As an article of manufacture, a cutter clamp for a backstroke cutting-"cit" tool, of

T the character described, comprising an angle iron having a'ehorizontal wing adaptedto overhanging, to engage the said blade, :1. a clamp screw hole'toward each end, and we'll jextendted length to'bear on and support, the V Vsaidcutter blade beyond the 'base pie c e, to whichit i'is adapted;-having-'also a,.:v 1.-am1

' wing which, hangs suspended from above, is

an'overhanging lip, adapted to engage :and bear on'the said cutter blade and support it .{horizontah open cutter {holding channel cut" *in itsouter side' frorn its top edge down, leaving a high wall onone side and a low ffiange on the other; :a cutter blade adapted overhangingli -whichengages an .bear on the'topfedg'e of-a cutterfblade and an supported; below only by side pressure "thctoolclaniping device to come nearer the 'bladepa ll substantially-as set zfiorth.

, V 3. A back-stroke cutting-oil tool, comprising-2am angle iron base piece having a horizontal wing adapted to engage a clamping "device, having also avertical wing with a horizontal, open cutter holding channel cut in ts Outer SUIfIEilCGfIODTlfS top edge downward, leaving a highw'vall on one sideran'd a low'jflange 'on'the other; a cutter blade,

adapted to bear inthe said channel, whose cutting edge is turned downward, "level with "so the axi's ot the lathe 'to which'it is adapted, and projects slightly abovethe said high wall; an inverted angle iron-cutter clamp having a screw pressed horizontal wing with beyond the ,said base piece; and ineansfor engine lathe to which it 'is adapted? all sub- 'stantia'lly as stated.

; "4;, A back'stroke cutting-off tool, comprisan angleiron base piece having a horizontal wing apertured to engage clamping device, having also a vertical wing with a to rest in thesaid channe'l, with-cuttingedge downward, level "with the axis of the lathe to which it is adaptedfimd which (blade) presses against and projects above the said high wall; an inverted angle iron cutter is A engage and bear on the said cutter blade and having a' horizontal wing-adapted to engage ahclarnping device, having also a "vertical "wni'g with horizonta h'open cutter holding channelcut'in its outer surface fromits top edge downward, leaving a high wall on one side leaning 'outwardly'attop, and a low flange 'on the otherfa beveled and inverted cutterblade, ground flat onboth edges, adapted to rest inthe said channel an inter 20 looking. inverted angle iron cutter clamp 'hav- 1 niga'sc'rewpressed horizontal win with an bears on the saicl'blade'and' simultaneously forces it,

down in the said channel and over against th-e said high wall substantiallyas set forth. 1;, 6- A ba k t ngm t ip 1ng, an angle'iron base piece having a horiz'ontal wing apertured to engage a clarnpingdevice, havingialsoa vertical wingwith a horizontal, open cutter holding channel cut in its outer surface from its top edge down to a line level with the axis of the lathe to which it is adapted, leaving a high wall on one side, leaning outwardly at top, and a low flange on the other; a beveled and inverted cutter blade, with cutting edge downward, adapted to rest in the said channel; an inverted angle iron cutter clamp having a horizontal wing with an overhanging lip adapted to engage and bear on the-top edge of the said blade and extend and support it beyond the said base piece, having also a suspended vertical wing with side pressure against the vertical wing of the same; clamping screws adapted to engage both the base piece and cutter clamp, between which the said blade is interlocked and simultaneously forced down in the channel and over against the said high wall thereof; and means for clamping the said tool to the tool seat of a machine to which it is adapted; substantially as stated. a

7. A back-stroke cutting-01f tool, comprising an angle iron base piece having a hori-' zontal wing apertured to engage a clamping tool post, having also a vertical wing provided with clamping bolt holesand a cutter holding channel cut in its outer surface from its top edge downward; a cutter blade adapted to bear in the said channel; an inverted angle iron cutter clamp having a horizontal wing provided with clamping bolt holes and an overhanging lip which engages and bears on the said blade, having also a hanging vertical wing with a vertical depres sion which enables the clamping tool post to come nearer the said cutter blade; clamping bolts which engage both the base piece and cutter clamp to clamp the said blade;

and means for clamping the said tool to the downward; an inverted angle iron cutter clamp having a horizontal wing with an overhangin lip adapted to engage and bear on the saic blade; cutter clamping screws which engage both the base piece and cutter clamp to clamp thesaid cutter; and means 'for clamping the said tool to the tool seat of a machine to which it is adapted; sub stantially as set forth.

9. A back-stroke cuttingofi tool, ofthe character described, comprising an angle iron base piece having a horizontal wing adapted toengage a clamping device, and provided also with means for clamping a false bottom and inserted elevating liners, and having furthermore a vertical wing with a horizontal, open cutter holding channel cut in its outer surface; a cutter blade adapted to rest in the said channel; an inverted angle iron cutter clamp having a horizontal wing with an overhanging lip adapted to bear on and engage the said blade; cutter clamping screws which engage both the base Piece and cutter clamp; and means for clamping the said tool to the tool seat of a machine to iwhiih it is adapted; substantially as setort EDWARD F.-G. GIBBS. 

